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// https://govnokod.ru/26890#comment571155
// bormand 2 часа назад #
// Можно брейнфак запилить на операторах. Как раз вроде унарных хватает.
// & * - ~ ! -- + ++ --
#include <array>
#include <vector>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <limits>
struct Brainfuck {
public:
using IPType = uint16_t;
constexpr static size_t MAX_MEMORY = std::numeric_limits<IPType>::max();
std::array<uint8_t, MAX_MEMORY> memory{};
std::vector<char> app{};
IPType ip = 0;
IPType cell = 0;
IPType find_matching_tag(IPType cur_ip, char open, char close, int ip_direction)
{
size_t stack_size = 0;
do {
if (app[cur_ip] == close) {
--stack_size;
}
if (app[cur_ip] == open) {
++stack_size;
}
cur_ip += ip_direction;
} while (stack_size > 0);
return cur_ip - ip_direction;
}
IPType find_matching_close_tag(IPType cur_ip)
{
return find_matching_tag(cur_ip, '[', ']', 1);
}
IPType find_matching_open_tag(IPType cur_ip)
{
return find_matching_tag(cur_ip, ']', '[', -1);
}
void loop_open()
{
if (memory[cell] == 0) {
ip = find_matching_close_tag(ip);
} else {
++ip;
}
}
void loop_close()
{
if (memory[cell] != 0) {
ip = find_matching_open_tag(ip);
} else {
++ip;
}
}
void exec(char op)
{
switch (op) {
case '>': ++cell; break;
case '<': --cell; break;
case '+': ++memory[cell]; break;
case '-': --memory[cell]; break;
case '.': std::putchar(memory[cell]); break;
case ',': memory[cell] = static_cast<uint8_t>(std::getchar()); break;
case '[': loop_open(); return; // no ip advancing
case ']': loop_close(); return; // no ip advancing
}
ip++;
}
void run()
{
while (ip < app.size()) {
exec(app[ip]);
}
}
public:
Brainfuck & operator++() { app.push_back('>'); return *this; }
Brainfuck & operator--() { app.push_back('<'); return *this; }
Brainfuck & operator+() { app.push_back('+'); return *this; }
Brainfuck & operator-() { app.push_back('-'); return *this; }
Brainfuck & operator*() { app.push_back('.'); return *this; }
Brainfuck & operator&() { app.push_back(','); return *this; }
Brainfuck & operator!() { app.push_back('['); return *this; }
Brainfuck & operator~() { app.push_back(']'); return *this; }
Brainfuck & operator>>(const Brainfuck &) { run(); return *this; }
};
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